Toshiba MMU-AP0121MH, MMU-AP0181MH, MMU-AP0151MH, MMU-AP0091MH, MMU-AP0071MH Drain Piping Work

4 DRAIN PIPING WORK

CAUTION

•Install the drain piping so that the water drains effectively.

•Apply heat insulation to prevent dew condensation from forming.

•Incorrectly installed pipe work may result in a water leak.

Pipe material/Insulator and size

The following materials for piping work and insulation are to be procured locally.

	Hard vinyl chloride pipe socket for VP25
Pipe material Hard vinyl chloride pipe VP25
	(Outer diameter Ø32 mm)
Insulator	Foamed polyethylene foam, thickness:
	10 mm or more

Connection of drain pipe

•Connect the hard socket (Procured locally) to the hard socket side of the supplied flexible hose which has been installed.

•Connect the drain pipes (Procured locally) in turn to the connected hard sockets.

REQUIREMENT

Check the draining

After completion of drain piping,

Check water drains away and that no water leaks from any of the connecting parts. At the same time check for any abnormal sounds from the drain pump.

Ensure drainage is checked during cooling mode.

When the electric work has finished:

• Before installing the ceiling panel, pour water as

REQUIREMENT

• Using an adhesive agent for vinyl chloride,

connect the hard vinyl chloride pipes so that

water does not leak.

shown in the following figure, check water drains

from the drain pipe connecting port (Transparent) in

• Ensure insulating of the drain pipes and connecting parts on the indoor units.

• The drain pipe should have a downward slope of at least 1/100 and ensure there are no swells or blockages as this will cause abnormal sounds.

• The maximum traverse length of drain pipe is 20 m. Provide support brackets at intervals of 1.5 to 2 m where necessary to prevent movement.

• Install the combined piping as shown in the illustration.

• Do not create an air purge in the pipework, as the water would leak from this point.

As long as possible (10cm)

1.5m to 2m	Support
	bracket

1/100 or more

Heat downward insulator

Arched

shape NO

GOOD

Trap

• Allow sufficient time for the adhesive to set and

harden. (Refer to the instructions of the

adhesive.)

Drain up

When it is not possible to achieve a natural downward slope on the drain pipe, you can create a vertical lift

COOL mode and then check there are no water

leaks from the drain pipes.

When the electric work has not finished:

•	Pull out the float switch connector (3P: Red) from
	P.C. board connector (CN34: Red) of the electric
	parts box. (Ensure the power is turned off.)
•	Connect the single-phase 220-240V, 1N, 50Hz (or
	220V, 1N, 60Hz) power to the terminal blocks R (L)
	and S (N). (Never apply 220-240V to (A), (B), (U1)

VP25 VP25 VP25

(Collective pipes)

(Drain up) on the pipe.

• Set the height of the drain pipe within 850 mm from

the bottom surface of the ceiling.

and (U2).)

• Pour water referring to the next page figure.

(Amount: 1500 cc to 2000 cc)

24

•The hard vinyl-chloride pipe cannot be connected

directly to the drain pipe connecting port of the indoor unit. For connection with the drain pipe connecting port, ensure that the supplied flexible hose is fitted.

•Adhesive agent cannot be used for the pipe connecting port (hard socket) on the indoor unit.

Be sure to use the supplied hose band for fixing, otherwise there is a risk of damage or water leakage from the drain pipe connecting port.

	VP30 or more		Downward slope
			1/100 or more
Drain pipe connecting port					VP25 vinyl chloride pipe
(Hard socket)					(Procured locally)
	Attached hose band			Attached flexible hose
						Socket for VP25
	Soft socket	Hard socket
						(Procured locally)
Adhesive agent prohibited

•	The drain pipe should be piped from the drain pipe
	connecting port horizontally for a maximum of
	300 mm and then piped vertically.
•	After piping the vertical lift, ensure the pipe work is
	set to a downward gradient.

Rising up orless or less

•	When the power is turned on, the drain pump motor
	drives automatically. Check water is drained from
	the drain pipe connecting port (Transparent), and
	then check there is no water leak from the drain
	pipes.
•	After checking for water leaks on the drain, turn off
	the power supply, and re-attach the float switch
	connector to the original position (CN34) on the P.C.
	board and refit the electric parts box.

Connection of flexible hose

NO GOOD

max 45˚

627.5mm	850mm
	up

220–240V, 1N ~, 50Hz 220V 1N ~, 60Hz

R(L) S(N)

•	Insert the soft socket of the supplied flexible hose
	into the connecting port of the drain pipe.
•	Align the supplied hose band to the pipe connecting
	port end, and tighten.

OK

Riser (Trap)

300mm	Rising
or less

	White
CN34	Red
(RED)	Black

max	90˚ Bend
45˚

Indoor unit

Underneath of ceiling

Pull out connector CN34 (Red) from P.C. board.

Black

REQUIREMENT

•Fix the soft socket with the supplied hose band, tighten at the upper position of the unit.

•The supplied flexible hose can bend up to a maximum of 45°

Drain pipe connecting port (Transparent)

Indoor unit body

Align the attached hose band to the end of hose, set the tightening position upward, and then tighten it.

Flexible hose	VP25 vinyl chloride pipe
(Accessory)	(To be local procure)

Socket for VP25 vinyl chloride pipe (To be local procure)